JP2016180838A - projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector with the higher cooling efficiency for the optical component by suppressing the separation of the air flow and having the structure of a thin temperature border layer.SOLUTION: A projector 1 includes: a cooling fan 42 that discharges a cooling air W to a liquid crystal panel 341 as a cooling target; a liquid crystal panel frame 5 that holds the liquid crystal panel 341; and a turbulence generator 6 that is disposed at an end of the liquid crystal panel 341 on the upstream side of the cooling air W and generates the turbulence for the cooling air W and makes the turbulence flow to the liquid crystal panel 341. The turbulence generator 6 includes an inclined portion 62 with a first inclined surface 621, and a projection portion 61 formed on the first inclined surface 621 and having a second inclined surface 611 with a larger inclination angle than the first inclined surface 621 and disposed on the upstream side relative to the first inclined surface 621 and a third inclined surface 612 continuing to the second inclined surface 611 on the downstream side of the cooling air W and having the downstream side inclined toward the first inclined surface 621.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a projector.

  2. Description of the Related Art Conventionally, there is known a projector that projects image light by optically processing light emitted from a light source device with an optical system having a plurality of optical components. In recent years, with the increase in luminous flux of projectors, it is necessary to improve the cooling performance for optical components.

  In Patent Document 1, a thin line is arranged between an optical component that requires cooling, such as a light modulator, and a cooling air outlet, and air is blown to generate turbulent flow to cool the optical component. Is disclosed.

JP 2003-66534 A

However, when the cooling structure of Patent Document 1 is applied, for example, when the gap between the liquid crystal panel as the light modulation device and the polarizing plate becomes narrow, the generated turbulent vortex disappears when entering the gap and becomes a laminar flow. As a result, the temperature boundary layer becomes thick, it is difficult to transfer heat to the cooling air, and there is a problem that a good cooling effect cannot be obtained.
In addition, due to the shape of the optical components that require cooling, such as liquid crystal panels, and how the cooling air is blown, the airflow is separated around the optical components, so that the cooling air flows along the optical components. However, there was a problem that the cooling efficiency was lowered.
Accordingly, there has been a demand for a projector that can improve the cooling efficiency for optical components by suppressing the separation of the airflow and reducing the temperature boundary layer.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example is a projector that projects image light by optically processing light emitted from a light source device with an optical system having a plurality of optical components, and an optical component as a cooling target A cooling fan that discharges cooling air to the air, a holding member that holds the optical components, and an optical component or an optical component that is installed at the upstream end of the cooling air of the holding member and generates turbulent flow against the cooling air A turbulent flow generating section, wherein the turbulent flow generating section includes an inclined section having a first inclined surface, and a second inclined surface disposed at an upstream side with a larger inclination angle than the first inclined surface. And a protrusion formed on the first inclined surface having a third inclined surface that continues to the downstream side of the cooling air of the second inclined surface and inclines the downstream side toward the first inclined surface. And a section.

According to this application example, the turbulent flow generation unit includes the inclined portion having the first inclined surface. Since the turbulent flow generation part has an inclined part (first inclined surface), the flow of the cooling air is improved when the cooling air flows into the turbulent flow generation part, and the step between the optical component and the inclined part is suppressed. By doing so, it can reduce that a level | step difference acts as resistance with respect to cooling air.
The protruding portion has a second inclined surface and a third inclined surface continuous therewith, and is formed on the first inclined surface. The second inclined surface has a larger inclination angle than the first inclined surface and is arranged on the upstream side. The third inclined surface continues to the downstream side of the cooling air of the second inclined surface and inclines the downstream side toward the first inclined surface. With respect to such a protrusion, the cooling air generates turbulent flow when it flows on the third inclined surface after running on the second inclined surface. This turbulent flow mixes cooling air with a small momentum (slow speed) that flows near the exposed surface of the optical component and cooling air with a large momentum (high speed) that flows above the surface of the optical component. Active exchange of momentum is performed. Thereby, the thickness of the temperature boundary layer can be reduced, the heat of the optical component is efficiently transmitted to the cooling air, and the optical component can be efficiently cooled.
In addition, the turbulent flow generation unit is installed at the upstream end of the cooling air of the optical component or the holding member, and the momentum due to the turbulent flow described above continues to be supplied to the cooling air near the surface of the optical component. It is possible to suppress separation of the airflow in the surface of the optical component.
Accordingly, turbulence can be generated to suppress the separation of the air flow and the thickness of the temperature boundary layer can be reduced, so that a projector that improves the cooling efficiency for the optical component to be cooled can be realized.

  Application Example 2 In the projector according to the application example described above, it is preferable that the turbulent flow generation unit is installed on the upstream side of the separation point of the airflow.

  According to this application example, the momentum due to the turbulent flow described above continues to be supplied to the cooling air near the surface of the optical component by installing the turbulent flow generation unit upstream of the separation point of the airflow. It becomes difficult for the airflow to peel off, and the separation point of the airflow can be moved downstream from the inside of the surface of the optical component. Therefore, it is possible to suppress the occurrence of airflow separation within the surface of the optical component.

  Application Example 3 In the projector according to the application example described above, it is preferable that a plurality of protrusions be installed in a direction orthogonal to the inflow direction of the cooling air.

According to this application example, the entire surface of the optical component can be efficiently cooled by installing a plurality of protrusions of the turbulent flow generation unit in a direction perpendicular to the inflow direction of the cooling air.
In addition, since a plurality of them can be installed, the degree of freedom in how the cooling air flows can be improved. For example, in the case where there is a region (a region where the cooling air is desired to flow) particularly in the plane of the optical component, the cooling air can be caused to flow in that region by using a plurality of protrusions.

  Application Example 4 In the projector according to the application example described above, it is preferable that the second inclined surface has a concave curved surface portion in a side view.

  According to this application example, the second inclined surface has a concave curved surface portion in a side view, so that the cooling air easily rides on the second inclined surface and flows through the third inclined surface. , Turbulent flow can be easily generated.

  Application Example 5 In the projector according to the application example described above, the protrusion has a height h protruding from the first inclined surface, a width w of the protrusion when the optical component is viewed in plan, and a second height. When the angle formed between the plane parallel to the first inclined plane passing through the connecting portion between the inclined plane and the third inclined plane and the third inclined plane is a, it is formed at w = 2h and a = 45 °. It is preferable that

  According to this application example, the protrusions of the turbulent flow generation part are formed at w = 2h and a = 45 °, so that the protrusions are approximately triangular in a side view. By being formed in this way, it is possible to most efficiently reduce the turbulent flow generating part from acting as a resistance against the cooling air, and to efficiently generate and flow the turbulent flow. As a result, it is possible to realize a turbulent flow generation section that can most effectively achieve both a reduction in resistance and an improvement in the ease of turbulence generation and flow.

  Application Example 6 In the projector according to the application example, the optical component includes a polarizing plate, a retardation plate, a light modulation device that modulates light according to image information, and a polarization conversion device that aligns the polarization direction of the light. It is preferable.

  According to this application example, it is possible to efficiently cool the polarizing plate, the phase difference plate, the light modulation device, and the polarization conversion device that generate heat by incident light (light beam), thereby extending the life of the optical component. it can.

FIG. 1 is a diagram schematically illustrating a schematic configuration of a projector according to a first embodiment. The general perspective view which looked at the light modulation device provided with the turbulent flow generation part concerning a 1st embodiment from the emission side of modulated light. The figure which shows the simulation result of the wind speed of the cooling wind at the time of installing the turbulent flow generation part which concerns on 1st Embodiment in an optical modulation apparatus. The figure which shows the simulation result of the wind speed of a cooling wind when not installing a turbulent flow generation part in a light modulation apparatus. The figure which installed the turbulent flow generation | occurrence | production part in the exit side polarizing plate which concerns on 2nd Embodiment. The figure which shows the simulation result of the wind speed of the cooling wind at the time of installing the turbulent flow generation part which concerns on 2nd Embodiment in the exit side polarizing plate. The figure which shows the simulation result of the wind speed of a cooling wind when not installing a turbulent flow generation part in an exit side polarizing plate. The figure which installed the turbulent flow generation part in the injection | emission side polarizing plate which concerns on 3rd Embodiment. The figure which installed the turbulent flow generation part in the housing | casing for optical components which concerns on 4th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram schematically illustrating a schematic configuration of a projector 1 according to the first embodiment. FIG. 1 is a schematic view of the internal configuration of the projector 1 installed on the desk as viewed from above. FIG. 1 also schematically shows the cooling mechanism 4. With reference to FIG. 1, a schematic configuration and operation of the projector 1 of the present embodiment will be described.

  In the subsequent drawings including FIG. 1, for convenience of explanation, the traveling direction of light emitted from the light source device 30 and along the illumination optical axis OA is defined as a front direction (front side), and the opposite direction is defined as a rear direction (rear side). The direction in which light enters and exits the optical component is the front side, and the opposite direction is the rear side. And when it sees along the advancing direction of light, let the right direction be a right direction in the horizontal direction orthogonal to the illumination optical axis OA, and let the opposite direction be a left direction (left side). Furthermore, the direction orthogonal to the front-rear direction and the left-right direction and against the gravitational direction in the desktop installation posture is defined as the upward direction (upper side), and the opposite direction (gravity direction) is defined as the downward direction (lower side). In the subsequent drawings including FIG. 1, the dimensions and ratios of the constituent elements are shown as appropriately different from the actual ones in order to make the constituent elements large enough to be recognized on the drawings.

[Configuration and operation of projector 1]
The projector 1 modulates light (light flux) emitted from the light source device 30 by a liquid crystal panel 341 as a light modulation device in accordance with image information, and uses the modulated light as image light through a projection lens 35 to a screen (not shown). ) And the like. The projector 1 includes an optical unit 3, a control unit (not shown), a power supply unit (not shown) that supplies power to the control unit, and a cooling mechanism 4 that cools the inside of the projector 1. 10 is housed inside.

[Configuration and operation of optical unit 3]
The optical unit 3 operates based on control by the control unit and forms image light according to image information. As shown in FIG. 1, the optical unit 3 includes a light source device 30 having an arc tube 301 and a reflector 302, an illumination optical device having lens arrays 311 and 312, a polarization conversion device 313, a superimposing lens 314, and a collimating lens 315. 31. The optical unit 3 also includes a color separation optical device 32 having dichroic mirrors 321 and 322 and a reflection mirror 323, and an incident side lens 331, a relay lens 333, and a relay optical device 33 having reflection mirrors 332 and 334. ing.

  Further, the optical unit 3 includes three liquid crystal panels 341 (red light (R light) liquid crystal panel 341R, green light (G light) liquid crystal panel 341G, blue light (B light)) as light modulation devices. The electro-optical device 34 includes three incident-side polarizing plates 342, three outgoing-side polarizing plates 343, and a cross dichroic prism 344 as a color combining optical device. In addition, the optical unit 3 includes a projection lens 35 as a projection optical device that optically processes and emits image light emitted from the electro-optical device 34. The optical unit 3 includes an optical component housing 36 that houses the optical devices 30 to 33. Note that the three incident-side polarizing plates 342 constituting the electro-optical device 34 are accommodated in the optical component casing 36.

  With the above-described configuration, the optical unit 3 separates light emitted from the light source device 30 and passing through the illumination optical device 31 into three color lights of R light, G light, and B light by the color separation optical device 32. Each separated color light is modulated by each liquid crystal panel 341 according to image information, and formed as modulated light for each color light. The modulated light for each color light enters the cross dichroic prism 344 and is combined as image light, optically processed through the projection lens 35, and enlarged and projected onto a screen or the like. In addition, about each optical apparatus 30-35 mentioned above, since it is utilized as an optical system of various general projections, concrete description is abbreviate | omitted.

[Fixing of optical unit 3]
In the electro-optical device 34, an exit-side polarizing plate 343 and a liquid crystal panel 341 are installed for each color light on three adjacent side surfaces of the cross dichroic prism 344. The cross dichroic prism 344 is fixed to the fixed substrate 37.

  The optical system includes an optical unit fixing portion 38 that fixes the entire optical unit 3. The optical unit fixing portion 38 is provided with a projection lens fixing portion 381, and the flange 351 of the projection lens 35 is fixed to the projection lens fixing portion 381. The optical unit fixing portion 38 is provided with a fixed substrate 37 to which the electro-optical device 34 is fixed. In addition, an optical component housing that houses the optical devices 30 to 33 with the electro-optical device 34 sandwiched from three directions. A body 36 is installed. The optical unit fixing part 38 to which the optical unit 3 is fixed is fixed to a lower case (not shown) constituting the exterior housing 10.

[Configuration of Cooling Mechanism 4]
The cooling mechanism 4 includes a dust-proof filter 41, a cooling fan 42, a duct (not shown), an exhaust fan 43, and the like. The cooling fan 42 is installed on the inner surface side of the side surface of the exterior housing 10 formed in a substantially rectangular parallelepiped shape via a dustproof filter 41. The duct is installed so as to be connected to the discharge port 421 of the cooling fan 42. The duct branches into a plurality of parts and extends to the vicinity of an optical component that needs to be cooled (to be cooled). The exhaust fan 43 is installed on the inner surface side of the side surface of the exterior housing 10.

  In the present embodiment, the optical components to be cooled are the incident-side polarizing plate 342, the emission-side polarizing plate 343, the liquid crystal panel 341 as a light modulation device that modulates light according to image information, and the light polarization direction. The polarization conversion device 313 is used. The light source device 30 is also an optical component (light source device) to be cooled.

[Operation of cooling mechanism 4]
By operating the cooling fan 42, outside air is sucked as cooling air W from the outside of the exterior housing 10 through the filter 41. The sucked cooling air W flows from the discharge port 421 of the cooling fan 42 into the duct. In this embodiment, the duct extends to the lower part of the liquid crystal panel 341, the exit side polarizing plate 343, and the incident side polarizing plate 342 constituting the electro-optical device 34. Specifically, the duct is branched into three for each color light (R light, G light, B light), and is installed with an ejection port (not shown) below the optical element for each color light.

  The cooling air W that has flowed through the duct is discharged from a discharge port that is branched for each color light. In the present embodiment, the discharged cooling air W is blown from the lower side to the upper side of the liquid crystal panel 341, the emission side polarizing plate 343, and the incident side polarizing plate 342 for each color light. As a result, the cooling air W takes heat from the heated liquid crystal panel 341, the exit-side polarizing plate 343, and the incident-side polarizing plate 342.

  Moreover, the duct is installed so that it may be located in the lower part of the polarization converter 313 in this embodiment. Then, the cooling air W discharged from the discharge port (not shown) of this duct is blown from the lower side to the upper side of the polarization conversion device 313. Thereby, the cooling air W takes heat of the polarized light conversion device 313 that has generated heat.

  Then, when the exhaust fan 43 is operated, the cooling air W inside the outer casing 10 that has been heated by taking heat of each optical component is exhausted to the outside of the outer casing 10. By this series of operations, the optical component is cooled. Note that the cooling mechanism 4 of the present embodiment also cools by taking away heat due to heat generated in a circuit block (not shown) constituting the control unit, a power supply unit, and the like.

  FIG. 2 is a schematic perspective view of the light modulation device (liquid crystal panel 341) in which the turbulent flow generation unit 6 according to the first embodiment is installed as viewed from the light incident side. The turbulent flow generation unit 6 installed in the light modulation device (liquid crystal panel 341) will be described with reference to FIG.

[Configuration of Liquid Crystal Panel 341]
The liquid crystal panel 341 includes an element substrate (not shown) having a pixel electrode (not shown) and a switching element (not shown) connected to the pixel electrode, and a counter substrate (not shown) disposed to face the element substrate. And have. Liquid crystal is sealed and sealed in the liquid crystal panel 341 between the element substrate and the counter substrate. The liquid crystal panel 341 includes a dust-proof transparent substrate (not shown) on the outer surfaces of the element substrate and the counter substrate.

[Configuration of LCD panel frame 5]
The liquid crystal panel frame 5 as a holding member accommodates and holds the liquid crystal panel 341. The liquid crystal panel frame 5 generally includes a first frame 51, a second frame 52, and a third frame 53 from the light incident side.

  The first frame 51 is installed on the side where the light from the light source device 30 is incident on the liquid crystal panel 341, is formed in a substantially rectangular shape by bending a metal plate, and holds the incident side of the liquid crystal panel 341. The first frame 51 has an opening 511 (see FIG. 2) through which light enters. The first frame 51 has two engaging portions 512 that are bent at the left and right ends, respectively, and engages with a protrusion 522 formed on the side surface of the second frame 52 in which the liquid crystal panel 341 is accommodated. The liquid crystal panel 341 is held. The liquid crystal panel 341 housed in the liquid crystal panel frame 5 exposes the incident-side surface 341 a from the opening 511 of the first frame 51.

  The second frame 52 is formed in a substantially rectangular frame shape, accommodates the liquid crystal panel 341 from the light incident side to the inside, and has an opening (not shown) on the emission side. The second frame 52 and the third frame 53 are bonded and integrated. The third frame 53 is formed in a substantially rectangular plate shape and holds the emission side of the liquid crystal panel 341. In addition, an opening 531 (see FIG. 3A) through which modulated light is emitted is formed at the center of the third frame 53.

[Configuration of Turbulent Flow Generation Unit 6]
The turbulent flow generation unit 6 is formed in the second frame 52. The turbulent flow generation unit 6 includes an inclined portion 62 having a first inclined surface 621 that forms the lower side of the second frame 52, and a protruding portion 61 installed on the first inclined surface 621. The turbulent flow generation unit 6 is installed below the second frame 52 and upstream from the liquid crystal panel 341. Specifically, in this embodiment, the turbulent flow generating portion 6 (projecting portion 61) is installed at an end portion of the second frame 52 on the upstream side from an air separation point α described later on the upstream side. .

  The inclined portion 62 (first inclined surface 621) is formed so as to suppress a step in the side surface direction (thickness direction) with the liquid crystal panel 341. The protrusion 61 is formed in a substantially triangular shape when viewed from the side. In the present embodiment, the protrusion 61 has a second inclined surface 611 having a larger inclination angle than the first inclined surface 621 and on the upstream side in the inflow direction W1 of the cooling air W. Further, in the present embodiment, the protruding portion 61 has a third inclined surface 612 that is continuous with the downstream side in the inflow direction W1 of the second inclined surface 611 and inclines the downstream side toward the first inclined surface 621. Yes.

  When the protrusion 61 is viewed from the side, the second inclined surface 611 is formed with a concave curved surface portion, and the third inclined surface 612 is formed with a flat surface. A plurality of protrusions 61 are installed in a direction orthogonal to the inflow direction W1 of the cooling air W. In the present embodiment, a total of seven protrusions 61 are provided over the entire area of the first inclined surface 621 (the entire area in the left-right direction of the opening 511).

  As shown in FIG. 2, the protrusion 61 having a triangular shape has a height h protruding from the first inclined surface 621, a width w of the protrusion 61 when the liquid crystal panel 341 is viewed in plan, and a second inclination. In the present embodiment, w = 2h, where a is an angle formed by a surface parallel to the first inclined surface 621 passing through the connecting portion of the surface 611 and the third inclined surface 612 and the third inclined surface 612. It is formed with a relationship of a = 45 °. Specifically, in the present embodiment, the protrusion 61 is formed with a height h = 1 mm, a width w = 2 mm, a length l = 3 mm along the first inclined surface 621, and a distance (pitch) p = 3.3 mm. Has been.

  The inclined portion 62 (first inclined surface 621) is formed at an angle of approximately 45 ° with respect to the surface around the opening 511 of the first frame 51, and the surface parallel to the first inclined surface 621 and the first surface. Since the third inclined surface 612 forms 45 °, the third inclined surface 612 is formed to be substantially parallel to the surface around the opening 511 of the first frame 51.

  FIG. 3 is a diagram showing a simulation result of the cooling air W when the turbulent flow generator 6 according to the first embodiment is installed in the light modulation device (liquid crystal panel 341), and FIG. The result in the cross section of the panel 341 in the vertical direction is shown, and FIG. 3B shows the result in the plane direction of the liquid crystal panel 341. 3A shows a vertical section at the center of the liquid crystal panel 341. FIG. FIG. 3B shows the vicinity of the surface 341 a that serves as an incident surface for light incident on the liquid crystal panel 341.

  FIG. 4 is a diagram showing a simulation result of the wind speed of the cooling air W when the turbulent flow generator 6 (protrusion 61) is not installed in the light modulator (liquid crystal panel 341), and FIG. 3 (a) shows the result in the vertical section of the liquid crystal panel 341, and FIG. 4 (b) shows the result in the plane direction of the liquid crystal panel 341, as in FIG. 3 (b). Yes.

  FIG. 4 shows a simulation result in the conventional structure, and is used to compare and explain the difference in the wind speed state from the case where the turbulent flow generation unit 6 of the present embodiment shown in FIG. 3 is installed. Yes. The only component is the difference in whether or not the protrusion 61 that constitutes the turbulent flow generation unit 6 is installed in the light modulation device, and the other components are configured in the same manner. In addition, the cooling air W for cooling the light modulator is a laminar flow (a fluid streamline is formed from the lower direction to the upper direction of the light modulator using the same wind speed (about 6 m / s). It is sprayed as a state parallel to the flow axis of the duct). It is assumed that the cooling air W flows in a gap between the liquid crystal panel 341 and the optical component (incident side polarizing plate 342) on the light incident side of the liquid crystal panel 341. This gap is about 2 mm.

  Regarding the wind speed in the simulation results shown in FIGS. 3A and 4A, the wind speed A indicates a range of about 9 to 10 m / s, the wind speed B indicates a range of about 10 to 11 m / s, The wind speed C indicates a range of approximately 11 to 12 m / s, and the wind speed D indicates a range of approximately 12 to 13 m / s. Accordingly, the relationship of A <B <C <D is established with respect to the magnitude of the wind speed. In addition, although the wind speed changes continuously, it has shown as a standard for comparison.

  Regarding the wind speed in the simulation results shown in FIGS. 3B and 4B, the wind speed E indicates a range of about 2 to 6 m / s, the wind speed F indicates a range of about 6 to 8 m / s, The wind speed G shows a range of about 8-9 m / s, and the wind speed H shows a range of about 9-10 m / s. Therefore, the relationship of E <F <G <H is established with respect to the magnitude of the wind speed. As described above, the wind speed changes continuously but is shown as a guide for comparison.

  When the turbulent flow generator 6 is installed in the light modulation device (liquid crystal panel 341) (FIG. 3B), the average wind speed is 7.5 m / s and the maximum wind speed is 10.0 m / s. ing. On the other hand, when the turbulent flow generation unit 6 is not installed in the light modulation device (liquid crystal panel 341) (FIG. 4B), the average wind speed is 7.0 m / s and the maximum wind speed is 9.0 m / s. s. As a result, by installing the turbulent flow generator 6 in the light modulation device, both the average wind speed and the maximum wind speed are improved as compared with the case where the turbulent flow generator 6 is not installed.

[Flow of cooling air W when turbulent flow generator 6 is not installed]
As shown in FIG. 4A, a conventional turbulent flow generating portion 6 (projecting portion 61) is not installed on the inclined surface 521 of the second frame 52 (corresponding to the first inclined surface 621 of the turbulent flow generating portion 6). In this case, when the cooling air W is blown onto the light modulation device from below, an air separation point α is generated near the top of the inclined surface 521 in the cross-sectional direction at the center of the light modulation device. Then, it becomes difficult for the cooling air W to be blown onto the surface of the light modulation device (surface 341a of the liquid crystal panel 341) on the downstream side after the separation point α of the airflow due to the separation of the airflow. Further, as shown in FIG. 4B, the wind velocity is also lowered due to the separation of the air current in the entire vicinity of the surface 341a of the liquid crystal panel 341. In addition, on the surface 341a of the liquid crystal panel 341, the temperature at the center is usually the highest as compared with the ambient temperature. Therefore, cooling the center portion is an efficient cooling method, but as shown in FIG. 4B, the center portion cannot be sufficiently cooled due to the influence of air flow separation.

[Flow of cooling air W when turbulent flow generator 6 is installed]
As shown in FIGS. 2 and 3A, in the case of the present embodiment in which the turbulent flow generation unit 6 is installed (the protruding portion 61 is installed on the first inclined surface 621 of the second frame 52), the turbulent flow generation unit The cooling air W that has flowed in from the lower direction rides on the second inclined surface 611 of the protruding portion 61 formed on the first inclined surface 621. Then, in the state of riding on the second inclined surface 611, the cooling air W, which is generally laminar, generates a turbulent flow when flowing on the third inclined surface 612 and flows downstream.

  This turbulent flow provides momentum to the cooling air W in the vicinity of the surface 341a of the liquid crystal panel 341 whose speed has been reduced. Specifically, due to turbulence, the cooling air W having a small momentum (slow speed) flowing near the surface 341a of the liquid crystal panel 341 and the cooling air W having a large momentum (fast speed) flowing above the surface 341a. Are mixed, and the exchange of momentum is actively performed. Thereby, the thickness of the temperature boundary layer can be reduced, and the heat of the liquid crystal panel 341 is efficiently transferred from the surface 341a to the cooling air W.

  Moreover, as shown in FIG. 3A, the turbulent flow generation unit 6 is installed on the upstream side (downward in the drawing) of the airflow separation point α (see FIG. 4A), The momentum due to the turbulent flow continues to be supplied to the cooling air W near the surface 341a of the liquid crystal panel 341. This makes it difficult for the airflow to peel off, and the airflow separation point α can be moved downstream (upward in the drawing). As shown in FIG. 3A, in this embodiment, the airflow does not peel off, and the cooling air W having a wind speed B flows from the lower side to the upper side along the surface 341 a of the liquid crystal panel 341.

  Further, as shown in FIG. 3B, in this embodiment, when the turbulent flow generation unit 6 is installed, a band-like region in which the speed increases on the surface 341a of the liquid crystal panel 341 (this is referred to as the present embodiment). , The velocity increasing region S) is formed by the turbulent flow generation unit 6. In addition, the turbulent flow generation part 6 (projection part 61) of this embodiment is installed so that the speed increase area | region S of the cooling air W may be formed in the center part of the surface 341a of the liquid crystal panel 341. As shown in FIG. 3B, in the present embodiment, the speed increasing region S formed by each protrusion 61 includes a cooling air W that rides on the protrusion 61 and generates turbulent flow, and a protrusion 61. Is formed in the vertical direction at a position downstream of the installation position of the protrusion 61 under the influence of the cooling air W that flows without riding on.

According to the embodiment described above, the following effects can be obtained.
In the projector 1 of the present embodiment, the turbulent flow generation unit 6 installed in the light modulation device (liquid crystal panel 341) includes an inclined unit 62 having a first inclined surface 621. Since the turbulent flow generation unit 6 includes the inclined portion 62 (first inclined surface 621), the fluidity of the cooling air W when the cooling air W flows into the turbulent flow generation unit 6 is improved, and the liquid crystal panel 341 is inclined. By suppressing the step with respect to the portion 62, it is possible to reduce the step from acting as a resistance against the cooling air W.
The protrusion 61 has a second inclined surface 611 and a third inclined surface 612 continuous thereto, and is formed on the first inclined surface 621. The second inclined surface 611 has a larger inclination angle than the first inclined surface 621 and is formed on the upstream side in the inflow direction W1 of the cooling air W. The third inclined surface 612 is continuous to the downstream side in the inflow direction of the second inclined surface 611 and is inclined downstream toward the first inclined surface 621. When the cooling air W flows on the second inclined surface 611 and then flows through the third inclined surface 612 with respect to such a protrusion 61, a turbulent flow is generated. Due to this turbulent flow, the cooling air W having a small momentum (slow speed) flowing near the exposed surface 341a of the liquid crystal panel 341 and a large momentum flowing (high speed) flowing above the surface 341a of the liquid crystal panel 341. The cooling air W is mixed and the momentum is actively exchanged. Thereby, the thickness of the temperature boundary layer can be reduced, the heat of the liquid crystal panel 341 is efficiently transmitted to the cooling air W, and the liquid crystal panel 341 can be efficiently cooled.
The turbulent flow generation unit 6 is installed at the end of the second frame 52 on the upstream side of the cooling air W with respect to the liquid crystal panel 341, and the cooling air W near the surface 341 a of the liquid crystal panel 341 has the above-mentioned. Since the momentum due to the turbulent flow continues to be supplied, the separation of the airflow in the surface 341a of the liquid crystal panel 341 can be suppressed.
Accordingly, the turbulent flow is generated to suppress the separation of the air flow, and the thickness of the temperature boundary layer can be reduced. Therefore, the projector 1 that improves the cooling efficiency for the liquid crystal panel 341 can be realized.

  In the projector 1 of the present embodiment, the turbulent flow generation unit 6 is installed upstream of the airflow separation point α, so that the cooling air W near the surface 341a of the liquid crystal panel 341 has a momentum due to the turbulent flow described above. Therefore, the airflow is less likely to be peeled off, and the peel point α of the airflow can be moved to the downstream side of the surface 341a of the liquid crystal panel 341. Accordingly, the occurrence of airflow separation can be suppressed within the surface 341a of the liquid crystal panel 341. In addition, by being able to move the air separation point α to the downstream side, the air path resistance can be reduced, and the fluidity of the cooling air W can be improved. Accordingly, even when the gap for flowing the cooling air W is narrow (the gap between the liquid crystal panel 341 and the member facing the liquid crystal panel 341 is narrow), the cooling air W can easily flow through the gap, and the gap is narrow. Even if it exists, the liquid crystal panel 341 can be cooled efficiently.

  In the projector 1 of the present embodiment, a plurality of turbulent flow generation units 6 (projections 61) installed on a liquid crystal panel 341 as a light modulation device are installed in a direction orthogonal to the inflow direction W1 of the cooling air W. Thereby, the whole surface 341a of the liquid crystal panel 341 can be efficiently cooled. Further, by providing a plurality, it is possible to install the liquid crystal panel 341 so that turbulent flow (in the present embodiment, the speed increasing region S) flows in the center of the surface 341a where the temperature of the liquid crystal panel 341 is higher than that of the surroundings. Thus, the degree of freedom for installing the cooling air W so that it flows in the area intended by the user is increased. In other words, the degree of freedom in how the cooling air W flows can be improved.

  In the projector 1 according to the present embodiment, the second inclined surface 611 has a concave curved surface portion in a side view, so that the cooling air W easily rides on the second inclined surface 611 and flows through the third inclined surface. In addition, turbulence can be easily generated.

  In the projector 1 according to the present embodiment, the protrusion 61 of the turbulent flow generation unit 6 is formed so that the width w of the protrusion 61 when the liquid crystal panel 341 is viewed in plan is w = 2h and is parallel to the first inclined surface 621. The angle a formed by the surface and the third inclined surface 612 is formed as a = 45 °. Thereby, the protrusion 61 can most efficiently reduce the turbulent flow generation unit 6 from acting as a resistance against the cooling air W, and can efficiently generate and flow the turbulent flow. . As a result, it is possible to realize the turbulent flow generation unit 6 that can most effectively achieve both a reduction in resistance and an improvement in the ease of turbulence generation and flow.

  In the projector 1 of the present embodiment, the turbulent flow generation unit 6 installed in the liquid crystal panel 341 as the light modulation device includes an inclined part 62 (first inclined surface 621) of the liquid crystal panel frame 5 that houses the liquid crystal panel 341, and The protrusion 61 is formed on the first inclined surface 621. Further, the protruding portion 61 is formed by the second inclined surface 611 and the third inclined surface 612. Thereby, the turbulent flow generation unit 6 for improving the efficiency of cooling can be realized with a simple configuration.

  In the projector 1 according to this embodiment, the cooling efficiency of the liquid crystal panel 341 is improved by the turbulent flow generation unit 6 installed in the liquid crystal panel 341, so that it is not necessary to increase the driving voltage of the cooling fan 42. Noise due to driving can be reduced.

  In the projector 1 of this embodiment, the turbulent flow generation unit 6 installed in the liquid crystal panel 341 can prevent the liquid crystal panel 341 from becoming high temperature by improving the cooling efficiency. Accordingly, the life of the liquid crystal panel 341 can be extended.

  When the output of the light source device 30 and the number of pixels of the liquid crystal panel 341 are the same, but the size of the liquid crystal panel 341 is different, the liquid crystal panel 341 having a smaller size has a higher heat density and more heat generation than the liquid crystal panel 341 having a larger size. It becomes easy to do. However, since the cooling efficiency can be improved by the turbulent flow generation unit 6 of the present embodiment, the liquid crystal panel 341 can be reduced in size, and the projector 1 can be reduced in size and weight.

[Second Embodiment]
FIG. 5 is a view in which the turbulent flow generation unit 7 is installed on the exit-side polarizing plate 343 according to the second embodiment, FIG. 5 (a) shows a perspective view, FIG. 5 (b) shows a plan view, FIG.5 (c) has shown the side view seen from the lower side. Note that the turbulent flow generation unit 7 of this embodiment is installed on the incident surface side on which the modulated light emitted from the liquid crystal panel 341 enters.

[Configuration of Ejection Side Polarizing Plate 343]
The exit-side polarizing plate 343 includes a polarizing plate main body 3431 composed of a film-like organic polarizing plate, and a translucent substrate to which the exit side of the polarizing plate main body 3431 is attached (in this embodiment, a transparent glass plate 3432). It consists of and.

[Configuration of Turbulent Flow Generation Unit 7]
The turbulent flow generation unit 7 of the present embodiment is configured by a plate-like inclined portion 72 having a first inclined surface 721 formed to be inclined, and a protruding portion 71 formed on the first inclined surface 721. Yes. In addition, the protrusion part 71 and the inclination part 72 are comprised integrally by injection molding using a synthetic resin material. As shown in FIG. 5, the turbulent flow generation unit 7 is installed (attached) in a region between a lower end 3432 a of the glass plate 3432 and a lower end 3431 a of the attached polarizing plate main body 3431.

  Specifically, the inclined portion 72 is formed in a rectangular shape having a first inclined surface 721 that gradually increases from the lower end portion 3432a of the glass plate 3432 to the lower end portion 3431a of the polarizing plate main body 3431. The thickness of the first inclined surface 721 that is the thickest is matched to the thickness of the lower end portion 3431a of the polarizing plate body 3431. The protrusion 71 is installed on the first inclined surface 721. It should be noted that the cooling air W at both ends flowing from the upstream side (downward in FIG. 5B) to the downstream side (upward in FIG. 5B) is applied to the left and right ends of the inclined portion 72. The projection 722 is inclined so as to flow toward the inner surface side of the emission side polarizing plate 343.

[Configuration of the protrusion 71]
As shown in FIG. 5, the protruding portion 71 is installed on the first inclined surface 721, and substantially the same as the protruding portion 61 of the turbulent flow generating portion 6 of the first embodiment, the second inclined surface 711 on the inflow side, and A third inclined surface 712 continuous with the second inclined surface 711 is formed, and is formed as a substantially triangular protrusion 71 in a side view. Further, when the protruding portion 71 is viewed from the side, as shown in FIG. 5A, the second inclined surface 711 is formed with a concave curved surface portion, and the third inclined surface 712 has a flat surface. Is formed.

  As shown in FIG. 5A, the protruding portion 71 has a height protruding from the first inclined surface 721 of h, a width of the protruding portion 71 of w, and the first protruding portion 61, as in the protruding portion 61 of the first embodiment. In the present embodiment, w = 2h, where a is an angle formed by a surface parallel to the first inclined surface 721 passing through the connecting portion between the second inclined surface 711 and the third inclined surface 712 and the third inclined surface 712. , A = 45 °. A plurality of protrusions 71 are installed in a direction orthogonal to the inflow direction W1 of the cooling air W. In the present embodiment, a total of nine protrusions 71 are installed over the entire area of the first inclined surface 721 (the entire area of the polarizing plate body 3431 in the left-right direction).

  FIG. 6 is a diagram showing a simulation result of the wind speed of the cooling air W when the turbulent flow generation unit 7 according to the second embodiment is installed on the emission side polarizing plate 343, and FIG. The result in the cross section of the vertical direction of 343 is shown, FIG.6 (b) has shown the result in the plane direction of the exit side polarizing plate 343. FIG. FIG. 6A shows a vertical cross section at the center of the exit-side polarizing plate 343. FIG. 6B shows the vicinity of the surface 3431b on which the modulated light of the exit side polarizing plate 343 (polarizing plate main body 3431) enters.

  FIG. 7 is a diagram illustrating a simulation result of the wind speed of the cooling air W when the turbulent flow generation unit 7 (projection 71) is not installed on the exit-side polarizing plate 343. FIG. ) Shows the result in the vertical section of the exit side polarizing plate 343, and FIG. 7B shows the result in the plane direction of the exit side polarizing plate 343, as in FIG. ing.

  FIG. 7 shows a simulation result in the conventional structure, and is used to compare and explain the difference in the wind speed state from the case where the turbulent flow generation unit 7 of the present embodiment shown in FIG. 6 is installed. Yes. The only component is the difference in whether or not the turbulent flow generation unit 7 is installed on the exit-side polarizing plate 343, and the other components are configured similarly. 6 and 7, the substrates BP1 and BP2 are installed in order to configure a flow path for performing the simulation. The glass plate 3432 is fixed to the substrate BP1. In addition, the cooling air W for cooling the emission side polarizing plate 343 is sprayed as a laminar flow from the lower side to the upper side of the emission side polarizing plate 343 using the same wind speed (about 6 m / s). ing. It is assumed that the cooling air W flows in a gap between the emission side polarizing plate 343 and the optical component (liquid crystal panel 341) on the light incident side of the emission side polarizing plate 343. This gap is about 2 mm.

  Regarding the wind speed in the simulation results shown in FIGS. 6A and 7A, the wind speed J indicates a range of about 5 to 7 m / s, the wind speed K indicates a range of about 7 to 8 m / s, The wind speed L indicates a range of about 8 to 9 m / s, and the wind speed M indicates a range of about 9 to 10 m / s. Therefore, the relationship of J <K <L <M is established with respect to the magnitude of the wind speed. In addition, although the wind speed changes continuously, it has shown as a standard for comparison.

  Regarding the wind speeds in the simulation results shown in FIGS. 6B and 7B, the wind speed N is in a range of about 1.5 to 3.5 m / s, and the wind speed O is about 3.5 to 4. The range of 5 m / s is shown, the wind speed P is in the range of about 4.5 to 5.5 m / s, and the wind speed Q is in the range of about 5.5 to 6.5 m / s. Therefore, the relationship of N <O <P <Q is established with respect to the magnitude of the wind speed. As described above, the wind speed changes continuously but is shown as a guide for comparison.

  In addition, when the turbulent flow generation part 7 is installed in the exit side polarizing plate 343 (FIG. 6B), the average wind speed is 4.0 m / s, and the maximum wind speed is 8.2 m / s. On the other hand, when the turbulent flow generation unit 7 is not installed on the exit-side polarizing plate 343 (FIG. 7B), the average wind speed is 4.1 m / s and the maximum wind speed is 7.6 m / s. ing. As a result, the maximum wind speed is improved by installing the turbulent flow generation unit 7 on the exit-side polarizing plate 343, although the average wind speed is not substantially changed as compared with the case where it is not installed.

[Flow of the cooling air W when the turbulent flow generator 7 is not installed]
As shown in FIG. 7A, in the conventional case where the turbulent flow generation unit 7 (projection 71) is not installed on the emission side polarizing plate 343, the cooling air W is blown onto the emission side polarizing plate 343 from below. In this case, an airflow separation point β is generated at the lower end portion 3431a of the polarizing plate main body 3431 in the cross-sectional direction at the center of the exit-side polarizing plate 343. Then, the cooling air W is hardly blown to the surface 3431b of the polarizing plate main body 3431 on the downstream side after the airflow separation point β due to the airflow separation. In addition, as shown in FIG. 7B, the wind speed is also reduced due to the separation of the air current in the entire vicinity of the surface 3431 b of the polarizing plate main body 3431. In addition, on the surface 3431b of the exit-side polarizing plate 343 (polarizing plate main body 3431), the temperature at the center is usually the highest as compared with the ambient temperature. Therefore, cooling the central portion is an efficient cooling method, but as shown in FIG. 7B, the central portion cannot be sufficiently cooled due to the influence of air flow separation.

[Flow of cooling air W when the turbulent flow generator 7 is installed]
As shown in FIGS. 5 and 6A, in the case of the present embodiment in which the turbulent flow generation unit 7 is installed on the exit-side polarizing plate 343, the cooling air W flowing in from below the turbulent flow generation unit 7 is It rides on the second inclined surface 711 of the protrusion 71 formed on the first inclined surface 721. Then, after riding on the second inclined surface 711, the cooling air W, which is almost laminar, generates a turbulent flow when flowing on the third inclined surface 712 and flows downstream.

  This turbulent flow supplies momentum to the cooling air W in the vicinity of the surface 3431b of the polarizing plate main body 3431 whose speed has decreased. Since the operation due to the turbulent flow is the same as that of the first embodiment, the description is omitted. Thereby, the thickness of the temperature boundary layer can be reduced, and the heat of the polarizing plate main body 3431 is efficiently transmitted from the surface 3431b to the cooling air W.

  Moreover, as shown in FIG. 6A, the turbulent flow generation unit 7 is installed on the upstream side (downward in the drawing) of the air flow separation point β (see FIG. 7A), The momentum due to the turbulent flow continues to be supplied to the cooling air W in the vicinity of the surface 3431b of the polarizing plate main body 3431. This makes it difficult for the airflow to peel off, and the airflow separation point β can be moved downstream (upward in the drawing). As shown in FIG. 6 (a), in the present embodiment, the airflow flows so as to reduce or prevent the separation of the airflow as compared with the case where the turbulent flow generation unit 7 is not installed (FIG. 7 (a)). Further, as shown in FIG. 6B, also in this embodiment, a plurality of speed increase regions S are formed corresponding to the protrusions 71 as in the first embodiment.

  According to the present embodiment, the same effects as in the first embodiment can be obtained, and the following effects can be obtained.

  In the projector 1 of the present embodiment, the turbulent flow generation unit 7 installed on the exit-side polarizing plate 343 is formed on an inclined portion 72 having a first inclined surface 721 and an inclined portion 72 (first inclined surface 721). The protrusion 71 has a second inclined surface 711 and a third inclined surface 712. And the turbulent flow generation part 7 can be easily installed in the emission side polarizing plate 343 by sticking the turbulent flow generation part 7 to the glass plate 3432 holding the film-like polarizing plate main body 3431. By such a turbulent flow generation unit 7, it is possible to improve the formability of the turbulent flow generation unit 7 and the compatibility with the installation location.

[Third Embodiment]
FIG. 8 is a diagram in which a turbulent flow generation unit 7A is installed on the exit-side polarizing plate 343A according to the third embodiment, FIG. 8 (a) shows a perspective view, FIG. 8 (b) shows a plan view, FIG. 8C shows a side view seen from below. Note that the turbulent flow generation unit 7A of the present embodiment is installed on the incident surface side on which the modulated light emitted from the liquid crystal panel 341 enters.

  Unlike the second embodiment, the present embodiment is an embodiment in which the turbulent flow generation unit 7A is applied to the transmission-type inorganic polarizing plate as the emission-side polarizing plate 343. In the following description, the emission side polarizing plate 343 in the second embodiment is replaced with an emission side polarizing plate 343A.

[Configuration of Ejection Side Polarizing Plate 343A]
The exit-side polarizing plate 343A of the present embodiment is configured to have a wire grid layer in which a large number of fine linear ribs made of aluminum or the like are arranged in parallel on a quartz glass substrate. The exit-side polarizing plate 343A transmits polarized light having a polarization direction perpendicular to the extending direction of the linear ribs and absorbs polarized light having a polarization direction parallel to the extending direction of the linear ribs.

[Configuration of Turbulent Flow Generation Unit 7A]
In the present embodiment, the turbulent flow generation unit 7A configured similarly to the turbulent flow generation unit 7 of the second embodiment is used. Specifically, the turbulent flow generation portion 7A of the present embodiment includes a plate-like inclined portion 72A having a first inclined surface 721A formed to be inclined, and a protruding portion 71A formed on the first inclined surface 721A. It consists of The protruding portion 71A of the present embodiment corresponds to the protruding portion 71 of the second embodiment, and the inclined portion 72A of the present embodiment corresponds to the inclined portion 72 of the second embodiment. Further, the second inclined surface 711A and the third inclined surface 712A of the present embodiment correspond to the second inclined surface 711 and the third inclined surface 712 of the second embodiment. Further, the first inclined surface 721A and the protruding portion 722A of the present embodiment correspond to the first inclined surface 721 and the protruding portion 722 of the second embodiment. The turbulent flow generation unit 7A is installed at the lower end of the surface on the opposite side to the surface on which the wire grid layer of the exit-side polarizing plate 343A is formed (incident surface side where modulated light is incident in this embodiment). The

  Since the flow of the cooling air W by installing the turbulent flow generation unit 7A on the exit side polarizing plate 343A formed of an inorganic polarizing plate is substantially the same as that of the second embodiment, the description thereof is omitted. Moreover, the same effect as 2nd Embodiment can be acquired by installing the turbulent flow generation part 7A in the emission side polarizing plate 343A.

[Fourth Embodiment]
FIG. 9 is a diagram in which the turbulent flow generation unit 8 is installed in the optical component casing 36 according to the fourth embodiment, and FIG. 9A is a perspective view of the turbulent flow generation unit 8 viewed from below. FIG. 9B is an enlarged cross-sectional view of the turbulent flow generation unit 8.

  As shown in FIG. 9, the turbulent flow generation unit 8 of the present embodiment is installed in the optical component casing 36. Specifically, the turbulent flow generation unit 8 is installed in a lower region that accommodates the incident-side polarizing plate 342 in the optical component housing 36. In FIG. 9, for convenience of explanation, an incident-side polarizing plate 342 </ b> R for R light is shown as the incident-side polarizing plate 342. The turbulent flow generation unit 8 is not limited to the R light incident side polarizing plate 342R, but also in the lower region that accommodates the G light incident side polarizing plate 342G and the B light incident side polarizing plate 342B. Each incident-side polarizing plate 342 is cooled.

  The incident-side polarizing plate 342 constituting the electro-optical device 34 is accommodated in the distal end portion of the optical component casing 36. Similarly, the liquid crystal panel 341 and the exit-side polarizing plate 343 constituting the electro-optical device 34 are installed in the cross dichroic prism 344. The cross dichroic prism 344 is fixed to a fixed substrate 37 (not shown in FIG. 9).

[Configuration of Incident Side Polarizing Plate 342]
The incident-side polarizing plate 342 of the present embodiment uses an organic polarizing plate, and is configured in substantially the same manner as the emission-side polarizing plate 343 (the polarizing plate main body 3431 and the glass plate 3432) of the second embodiment. Specifically, it is composed of a film-like polarizing plate main body 3421 and a translucent substrate (in this embodiment, a transparent glass plate 3422) to which the polarizing plate main body 3421 is attached.

[Configuration of Polarizing Plate Housing 361]
As shown in FIG. 9, a pair of polarizing plate housing portions formed at the front end portion of the optical component housing 36 project from both sides of the side surface facing the liquid crystal panel 341 toward the front side (the liquid crystal panel 341 side). 361 is formed. Slit grooves (not shown) are respectively formed on the opposing side surfaces of the polarizing plate housing portion 361 from the upper end portion until it comes into contact with an inclined portion 82 of a turbulent flow generation portion 8 described below in the downward direction. The incident-side polarizing plate 342 is accommodated by inserting the left and right ends of the glass plate 3422 into the slit groove, inserting them from above, and sliding them downward. In this case, the polarizing plate body 3421 of the incident side polarizing plate 342 is inserted so as to face the liquid crystal panel 341 side.

[Configuration of Turbulent Flow Generation Unit 8]
In this embodiment, the turbulent flow generation unit 8 is installed by connecting the pair of polarizing plate accommodation portions 361, and the lower end portion of the incident side polarization plate 342 to be accommodated (specifically, the lower end portion of the glass plate 3422) is applied. It is formed to contact. The turbulent flow generation unit 8 according to the present embodiment includes a plate-like inclined portion 82 having a first inclined surface 821 formed to be inclined, and a protruding portion 81 formed on the first inclined surface 821. Yes. The inclined part 82 constitutes the turbulent flow generation part 8 and also constitutes the polarizing plate accommodation part 361.

[Configuration of the inclined portion 82]
The inclined part 82 has a first inclined surface 821 on the side facing the liquid crystal panel 341. As shown in FIG. 9B, the inclined portion 82 (first inclined surface 821) is formed so that the upper end portion in contact with the incident-side polarizing plate 342 is thick and the lower end portion is thin. Further, the thickness of the upper end portion of the inclined portion 82 is formed to be the same as the thickness of the glass plate 3422 of the incident side polarizing plate 342 in the present embodiment. Further, the upper end portion of the first inclined surface 821 is formed so as to substantially coincide with the front surface of the glass plate 3422.

[Configuration of the protrusion 81]
As shown in FIG. 9, the protruding portion 81 is installed on the first inclined surface 821, and substantially the same as the protruding portion 61 of the turbulent flow generating portion 6 of the first embodiment, the second inclined surface 811 on the inflow side, and A third inclined surface 812 continuous with the second inclined surface 811 is formed, and is formed as a substantially triangular protruding portion 81 in a side view. When the protrusion 81 is viewed from the side, the second inclined surface 811 is formed with a concave curved surface portion, and the third inclined surface 812 is formed with a flat surface. A plurality of protrusions 81 are installed in a direction orthogonal to the inflow direction W1 of the cooling air W. In the present embodiment, a total of seven protrusions 81 are provided over the entire area of the first inclined surface 821.

  The cooling air W is blown from the lower direction of the turbulent flow generation unit 8 upward to the turbulent flow generation unit 8 configured as described above. In addition, since the method of the flow of the cooling air W with respect to the turbulent flow generation unit 8 is the same as that in the first embodiment, the description thereof is omitted. The same effect as that of the first embodiment can be obtained by installing the turbulent flow generation unit 8 in the polarizing plate accommodating portion 361 of the optical component housing 36 in which the incident side polarizing plate 342 is accommodated.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below.

  In the projector 1 according to the first embodiment, the plurality of protrusions 61 of the turbulent flow generation unit 6 are formed at equal intervals with a predetermined pitch p of p = 3.3 mm. However, the plurality of protrusions 61 are not limited to being formed at an equal pitch p. For example, in the case where there is a region (a region where the cooling air W is desired to flow) particularly in the plane of the optical component, there is no limitation to the pitch p, and a plurality of protrusions so that the cooling air can flow in that region. May be arranged. By making it correspond to the plurality of projecting portions 61 in this way, the degree of freedom in how the cooling air W flows is improved. The same applies to the second to fourth embodiments.

  In the projector 1 according to the first embodiment, the second inclined surface 611 in the protruding portion 61 of the turbulent flow generation portion 6 has a concave curved surface portion in a side view. However, the present invention is not limited to this, and the second inclined surface 611 may be a flat surface in a side view or may have a convex curved surface. Further, the cross-sectional shape in the direction orthogonal to the inflow direction W1 of the cooling air W may have a curved surface shape. In other words, the protrusion 61 takes into consideration that the cooling air W rides on the second inclined surface 611 while suppressing the resistance of the cooling air W, and the turbulent flow is generated on the third inclined surface 612. It is sufficient to set the shape. The same applies to the second to fourth embodiments.

  In the projector 1 according to the first embodiment, the protrusion 61 of the turbulent flow generator 6 has a height protruding from the first inclined surface 621 h, and a width of the protrusion 61 when the liquid crystal panel 341 is viewed in plan view is w. When an angle formed by a plane parallel to the first inclined plane 621 passing through the connecting portion between the second inclined plane 611 and the third inclined plane 612 and the third inclined plane 612 is a, w = 2h, a = It is formed at 45 °. With this relationship, the protrusion 61 is formed, and in the present embodiment, the most efficient value that can achieve both the generation of turbulence and the ease of flow and the reduction of resistance is achieved. . However, the relationship between the height h, the width w, and the angle a may not be limited to this relationship. Further, the plurality of protrusions 61 may be formed by changing the height h, the width w, and the angle a. By making it correspond to the plurality of projecting portions 61 in this way, the degree of freedom in how the cooling air W flows can be improved. The same applies to the second to fourth embodiments.

  In the projector 1 of the second embodiment and the third embodiment, the turbulent flow generation unit 7 and the turbulent flow generation unit 7A are installed on the emission side polarizing plate 343 and the emission side polarizing plate 343A, respectively. However, the cooling target of the turbulent flow generation unit 7 and the turbulent flow generation unit 7A is not limited to the emission side polarizing plate 343 and the emission side polarizing plate 343A. The turbulent flow generation unit 7 or the turbulent flow generation unit 7A may be installed on the incident side polarizing plate 342 to cool the incident side polarizing plate 342.

  In the projector 1 of the fourth embodiment, the turbulent flow generation unit 8 is installed in a lower region that houses the incident side polarizing plate 342 and cools the incident side polarizing plate 342. However, the cooling target of the turbulent flow generation unit 8 is not limited to the incident side polarizing plate 342. The emission side polarizing plate 343 may be cooled by installing the turbulent flow generation unit 8 in a lower region of the emission side polarizing plate 343. Further, when the exit-side polarizing plate 343 is held by a holding member separate from the optical component casing 36, the turbulent flow generation unit 8 may be installed on the holding member separate from the optical component casing 36. Good.

  In the projector 1 of the embodiment, the optical components as the cooling target are described as the light modulation device (liquid crystal panel 341) and the polarizing plates (incident side polarizing plates 342 and 342A, emission side polarizing plate 343). However, the optical component to be cooled may be an optical component that generates heat by light, such as a polarization conversion device 313 that aligns the polarization direction of light, or a retardation plate. Thereby, the lifetime of the optical component can be extended.

  In the projector 1 of the embodiment, the light source device 30 uses a discharge-type arc tube 301. However, the present invention is not limited to this, and a solid light source may be used. Examples of solid light sources include laser light sources, LED (Light emitting diode) elements, organic EL (Electro Luminescence) elements, and various solid light emitting elements such as silicon light emitting elements.

  In the projector 1 according to the embodiment, the electro-optical device 34 adopts a so-called three-plate method using three light modulation devices corresponding to R light, G light, and B light. However, the present invention is not limited to this, and a single plate type light modulation device may be adopted. Further, a light modulation device for improving the contrast may be additionally employed.

  In the projector 1 of the embodiment, the electro-optical device 34 employs a transmissive light modulator (transmissive liquid crystal panel 341). However, the present invention is not limited to this, and a reflective light modulation device may be employed.

  In the projector 1 of the embodiment, the electro-optical device 34 employs a liquid crystal panel 341 as a light modulation device. However, the present invention is not limited to this, and the electro-optical device generally only needs to modulate incident light based on an image signal. For example, another type of light modulation device such as a micromirror light modulation device is used. You may do it. For example, a DMD (Digital Micromirror Device) can be adopted as the micromirror type light modulation device.

  In the projector 1 according to the embodiment, the optical unit 3 employs a lens integrator optical system including lens arrays 311 and 312 as the illumination optical device 31 that uniformizes the illuminance of light emitted from the light source device 30. However, the present invention is not limited to this, and a rod integrator optical system including a light guide rod may be employed.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 4 ... Cooling mechanism, 5 ... Liquid crystal panel frame, 52 ... 2nd frame (holding member), 6, 7, 7A, 8 ... Turbulence generating part, 30 ... Light source device, 42 ... Cooling fan, 61, 71, 71A, 81 ... projecting portion, 62, 72, 72A, 82 ... inclined portion, 313 ... polarization conversion device (optical component), 341 ... liquid crystal panel (optical component), 342, 342A ... incident side polarizing plate (optical component) 343: Emission side polarizing plate (optical component) 36: Optical component casing (holding member) 611, 711, 711A, 811 ... second inclined surface, 612, 712, 712A, 812 ... third inclined surface 621, 721, 721A, 821 ... first inclined surface, a ... angle, h ... height, p ... pitch, w ... width, W ... cooling air, W1 ... inflow direction, OA ... illumination optical axis, α, β ... Peeling point.

Claims (6)

A projector that projects image light by optically processing light emitted from a light source device with an optical system having a plurality of optical components,
A cooling fan for discharging cooling air to the optical component as a cooling target;
A holding member for holding the optical component;
A turbulent flow generating portion that is installed at an upstream end of the cooling air of the optical component or the holding member, and generates a turbulent flow with respect to the cooling air and flows to the optical component;
The turbulence generator is
An inclined portion having a first inclined surface;
The second inclined surface having a larger inclination angle than the first inclined surface and the second inclined surface arranged on the upstream side, and the downstream side of the second inclined surface downstream of the cooling air and the downstream side of the first inclined surface A protrusion having a third inclined surface inclined toward the inclined surface and formed on the first inclined surface;
A projector comprising: The projector according to claim 1,
The projector according to claim 1, wherein the turbulent flow generation unit is installed on the upstream side of an airflow separation point. The projector according to claim 1 or 2, wherein
A plurality of the projecting portions are installed in a direction orthogonal to the cooling air inflow direction. It is a projector as described in any one of Claims 1-3, Comprising:
The projector according to claim 1, wherein the second inclined surface has a concave curved surface portion in a side view. The projector according to claim 3 or 4, wherein
The protrusion is
The height protruding from the first inclined surface is h, the width of the protruding portion when the optical component is viewed in plan is w, and the connecting portion between the second inclined surface and the third inclined surface. When an angle formed by a plane parallel to the first inclined surface passing through and the third inclined surface is a,
A projector formed by w = 2h and a = 45 °. It is a projector as described in any one of Claims 1-5, Comprising:
The optical component includes a polarizing plate, a retardation plate, a light modulation device that modulates the light according to image information, and a polarization conversion device that aligns the polarization direction of the light.

Images